1994 Southampton Wildlife Link the Weston Common Valley Report

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1994 Southampton Wildlife Link the Weston Common Valley Report ----. - -- Southampton Wildlife Link ) ) .J © Southampton Wildlife Link 1 Chairman: Julian Cremona B.Sc., C. BioI., F.R.E.S., P.G.C.E. Report First published March 1994 , ] Produced by the Southampton Wildlife Link ;1 The Southampton Wildlife Link is a voluntary body which meets monthly at the Civic Centre. It consists of representatives from the chief ecological and natural history groups in the area. Those groups are: . 1 English Nature Southampton Schools Conservation Corps 1 Southampton Natural History Society Southampton Commons and Parks Protection Society j Hampshire & lOW Wildlife Trust Royal Society for the Protection of Birds British Trust for Ornithology Broadlands Valley Conservation Group British Butterfly Conservation Society Hawthorns Wildlife Association Sholing Valleys Study Centre Association Hampshire Bat Group J Correspondence to the Hon. Sec. Mrs. P. Loxton, 3 Canton Street, Southampton 1 '1 26 }! Southampton Wildlife Link 1 The Weston Corrunon Valley Report I l by ~ , 1 The Southampton Wildlife Link I Contents Weston Common . 3 Lepidoptera .. 21 I I Botany Bay . 5 Odonata . 22 Miller's Pond . 6 Diptera . 22 Mayfield Park .. 9 Coleoptera . 22 Observations & Recommendations . 10 Hemiptera . 23 Appendix 1 Species Lists .. 11 Hymenoptera . 23 Flowering Plants .. 11 Orthoptera . 23 Fungi . 17 Arachnida . 23 Birds .. 20 Myriapoda . 23 Mammals . 21 Crustacea .. 23 Amphibians & Reptiles . 21 Miller's Pond Fauna . 24 Arthropoda . 21 Appendix 2 Maps . 25 I 2 I ) Southampton Wildlife Link ~ ESTON COMMON and water-rails (see note 1). For its size, the marsh was rich in species and it hig robable that, in today's climate of J opinion, the citizens of S uthampton would countenance its destruction. The Southam'pt Natural History Society had made a The undeveloped remnant of old Weston Common detailed study of the flora and when the threat to the area became is the valley that runs roughly south-westwards from the Bursledon unavoidable, steps were taken to remove the two rarest species to a Road to Botany Bay and then through Mayfield Park to Archery safer habitat, as compatible as possible with the original. These were Road. The underlying rocks here are sands, silts and clays of the Ludwigia palustris (Hampshire Purslane), an extremely rare plant of Bracklesham group, Tertiary formations. These not only determine ) acid fen, and Butomus umbellatus (Flowering Rush). (See Note 2 for the natural vegetation but have influenced the use of the land. Sand the subsequent history of these transplants). and clay have been widely exploited throughout the region and, although much evidence has been hidden under subsequent 1 The contamination of the soil by refuse necessitated the piping development, the results of sand extraction are still visible at Botany underground of the two streams to their outfall beyond the Bay and the clay soil below the old Butts Road brickworks shows a Portsmouth Road into Mayfield Park. The raising of the ground- startling change of plants from the surrounding area. The open land 1 level resulted in an expanse of "dry" land between Botany Bay Road has been used for grazing, horticulture and recreation and hence and Spring Road, an "interruption" which effectively divides the much of today's plant cover is the result partly of restitution, partly valley into three parts. Even so, the natural vegetation of the valley { of natural regeneration. shows a remarkable consistency throughout its whole length. A second drastic change in the aspect of the old Common occurred The greatest change in land-use in recent years was the infil1ing of in the 'sixties when pasture and scrub-covered land between the old Miller's Pond and Botany Bay marsh with domestic refuse. Kathleen Road and Butts Road was developed for housing, and the The L-shaped pond was formed by the junction of the stream City acquired the remaining narrow valley as public open space with running through Weston Common with the spring from Sholing a walk-way downstream. Apart from the wet willow-scrub below Common. The latter formed a natural barrier and ran clear over a Willow-tree Walk, much of the land was stripped, the stream-bed gravel bed to the sluice at the bottom of Spring Road. On the other gouged out, and the banks cleared and reinforced where necessary to side there were reed-beds, fringed with willows, the home of swans J 3 Southampton Wildlife Link I 1 . J support bridges, and paths laid. Some replanting beside the stream The trees which favour the drier light soils here and throughout the was done, and today the stream itself is hidden for much of its valley, are oak, hawthorn, birch, holly, and elder, with an length. Natural vegetation has recovered, and aspen and alder understorey of b!cken, gorse, bramble and nettles. Unfortunately, : J sapling are spreading on to the open common, while below the older Japanese Knotwee~OUI;).·a japonica) is rapidly colonising the trees, Comfrey, ferns, Marsh Woundwort and Wavy Bittercress have ground disturbed by pathlaxing along the woodside, and should be j.' reappeared, together with pondweed in the water. eradicated at once. The operr-g assland which is mown shows little botanical interest compared with the rough turf with its more varied Much of the grassland is kept mown, but patches of broom, gorse, flora including the Musk Mallow, Fire-weed, Marsh Bird's-foot bracken and heather recall the nature of the old Common. Here, as Trefoil, Hard Heads, Mouse-ear Chickweed, and dog roses in the elsewhere throughout the valley, the turf supports the usual mixture thickets. The chief grass species are Rye Grass, Bent Grass, Crested of clovers, daisies, buttercups, Cat's-ear and Self-heal, plants which Dogs Tail, Fescue and Cock's Foot. False Oat-grass prefers the path can withstand constant cropping. But where the sandy soil changes sides with Timothy and Foxtail and the ubiquitous Annual Meadow abruptly to clay, the ground is frequently water-logged at the bottom Grass. In ground disturbed by the paths "common weeds of of the slope, and shows a change of vegetation which can tolerate cultivation" abound:- Pineapple weed (Matricaria matricoides), :I such conditions. The most striking example of this is Sphagnum Cudweed (Gnaphaliun uliginosumi, Knotgrass (PoZgonum moss, along with rushes, reeds and Sneezewort (Achilles ptarmicay. aviculare) Swinegrass (Coronopus didymus) and Hemp Nettle Repeated mowing is causing the loss of some of these plants; when (GaZeopsis tetrahit). With Scarlet Pimpernel and Speedwell they are I the rushes and Ling (Calluna vulgaris) were left uncut, the the first to colonise bare soiL distinctive air of this little area was more attractive. } Some cherry trees (Prunus avium) have been planted here and some As the stream descends towards Botany Bay, the valley bottom wild flower seeds sown, but it is doubtful if this last has materially becomes water-logged throughout much of its length, the banks effected the flora of the Common. Privet is probably an escape. t being shallow and muddy. Willow-scrub with Hemlock Water- dropwort dominates the ground cover, and this gives way, beyond North-east Road to a dense thicket of alders and willows which cuts I out the light and prevents very little other growth: The Common here is accessible only on the eastern side, where a path runs through a strip of woodland on the higher ground to open, grassy areas. 4 I Southampton Wildlife Link 1 OTANY BAY It was not long before children were finding newts in damp stony patches in the middle of the tip, and today those patches are marked by clumps of mature willow (Salix cinerea and S. capraea) with Beside Station Road, lies another stretch of open wound young oaks, and brambl~~ere the Weston Stream disappeared at reminiscent of the old common, with rough grass, B Botany Bay Rb~Id ~h flora has reasserted itself in a wet, brambles, broom, nettles and common weeds such as Yarrow rushy dip with Common Reed, Great Willow Herb and Marsh (Achillea millefoliay, Ragwort (Senecio jacobaea) and Wormwood Bird's-foot Trefoil and 5 species of rush (Jointed, Soft, Hard, and Mugwort (Artemisia vulgaris). Beyond is a stretch of woodland, Conglomerate and Sharp flowered). Below the railway embankment, once intersected by the Spring from Spring Road. On the higher willows continued to flourish and today there is a continuous belt of ground, oaks, aspen, holly, hawthorn and sycamore dominate; trees linking the oaks, beeches, and sycamores along the Portsmouth below, the old marsh flora survives, alder and sallows and crack ~ Road. Ground Ivy flourishes in the established hedgerow, and at the willows. There are innumerable muddy tracks through the bottom of Spring Road there stands a very old False Acacia (Robinia woodland, where the ground flora is very poor, consisting largely of pseudacacia). J ivy and with clumps of male fern. The land slopes sharply to the south west to the railway embankment that limited the old Miller's Pond. Although tipping raised the ground level, the course of the Spring remained below the level of the surrounding land, and here especially and along the line } of the old Weston stream, new wetland soon developed when tipping stopped. A little marsh quickly revived amongst the surviving willows and alders, where water-rails continued to breed t until the new pond was excavated. Water Forget-me-nots, Water Plantain and Bur-Reed rapidly colonised the bed of the Spring, and J Water Crowfoot spread over muddy ground until this was over- grown with Iris, Greater Willow Herb, Water Dropwort and sapling u_~ willows. 1 '-...._;;7 t 5 JU Southampton Wildlife Link I J The open tip site was left to recover naturally and where the top soil The grant from the Nature Conservancy Council (English Nature) is thin and patchy wasteland weeds abound - Ribwort Plantain, for the re-creation of the pond enabled English Nature in the future Scarlet Pimpernel, Black Medic, Wormwood, Yarrow and a rather to maintain an interest in it for a further five years.
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